Should a sedan's radiator be filled with water or coolant?

[ColinAnn]

Sedan radiators should be filled with coolant. If water circulates through the engine, especially during major circulation when it flows into the radiator behind the grille, impure water can create scale deposits that clog the cooling system. This can lead to engine power loss and increased wear. Additionally, high-temperature water is prone to evaporation, causing coolant deficiency in the system, which may result in cylinder scoring, cylinder head deformation, or even complete engine failure in severe cases. Coolant is a specially formulated fluid containing additives, primarily used in liquid-cooled engine cooling systems. It offers excellent properties such as freeze protection in winter, boil-over prevention in summer, year-round anti-scaling, and corrosion resistance. It prevents the cooling liquid from freezing and expanding in cold winter conditions, which could otherwise crack the radiator or damage the engine block and cylinder head.

[VonMackenzie]

I've been driving for several years and always believed that the radiator must be filled with antifreeze, not just water. Although adding water is simple and cost-effective, the entire system can freeze and burst in sub-zero temperatures during winter, and it's prone to boiling over in high summer heat, damaging the engine. My cousin spent over 2,000 yuan on repairs because he used water—totally not worth it. Antifreeze, with its specialized formula, can prevent freezing down to -40 degrees, resist corrosion, and prevent boiling, protecting both the radiator and the engine. Remember to regularly check the fluid level; if it's below the MIN line, top it up immediately—don't slack off. When I buy a new car, I always check the manual for the recommended type, as different vehicles require different antifreeze. It's best to inspect it once when seasons change to ensure safe driving.

[ColeLynn]

I've been driving since I was young, and now with kids at home, I pay extra attention to coolant system maintenance. Using antifreeze is a must - adding water carries too much risk, especially during long trips where breakdowns could occur. My neighbor once used water and ended up blowing his engine hood on the highway last summer, costing a fortune in towing fees. Antifreeze doesn't just prevent freezing and boiling; it also protects against pipe corrosion and aging, extending vehicle lifespan. I replace my antifreeze every two years - just tens of yuan per bottle, affordable and reliable. Always check coolant levels when the engine is cold; inspecting while hot risks burns. Developing good habits like this means longer vehicle life and safer, more secure rides for the family.

[LaBrady]

I think it's essential to add antifreeze instead of trying to save money by using water. Adding water might seem fine in the short term, but it can lead to freezing and cracking issues near the freezing point in winter, and it's also dangerous during high temperatures in summer. A single freeze-related repair could cost several hundred dollars, while a bottle of antifreeze only costs a few dozen. In the long run, it's much more cost-effective. Regular maintenance of the radiator can prevent trouble, saving both money and time, and it's simple to do it yourself.

[LeGideon]

As a car enthusiast, I've thoroughly researched the radiator coolant issue. Antifreeze is the top choice, containing ethylene glycol for higher boiling point to prevent overheating, lower freezing point to resist icing, and corrosion protection for the system. Pure water contains more minerals that accelerate corrosion and damage radiators over time. Adding water works temporarily in emergencies, but switch to antifreeze ASAP. Normally maintain fluid level between MAX and MIN marks, checking when the engine is cold for accuracy. Using the manufacturer-recommended type ensures worry-free performance.